Yi Ren

Mandarin Chinese for Beginners: Mastering Conversational Chinese (Fully Romanized and Free Online Audio)

Learning Mandarin Chinese Characters Volume 1: The Quick and Easy Way to Learn Chinese Characters! (HSK Level 1 & AP Exam Prep)

Mandarin Chinese Picture Dictionary: Learn 1,500 Key Chinese Words and Phrases (Perfect for AP and HSK Exam Prep; Includes Online Audio)

Learning Mandarin Chinese Characters Volume 2: The Quick and Easy Way to Learn Chinese Characters! (HSK Level 2 & AP Study Exam Prep Book)